How can I help my Year 10 son regain confidence in Maths?

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My son is in Y10. He has been doing well in Maths since starting secondary but last year didn't get on so well with his teacher and has fallen out of love with it. I think she tried to have a sort of banter with him that seems to have knocked his confidence.
Anyway, we already give him incentives for house points and I suggested an additional incentive if he gets house points in Maths. They get them for hard work etc, so not necessarily scores or grades.But he says he doesn't think he will get house points in Maths as the class is a bit rowdy and the teacher focuses on giving points to children who clearly struggle to settle.
This has just made me more concerned and not sure how to nudge him back on track. He wants to do well in GCSEs but I don't feel like he's motivated with Maths. I would love to hear ideas please!

If you can afford a tutor then this is your best bet to rebuild confidence.

You could contact the teacher and explain that your DS is feeling demotivated after his experience last year and ask them if they could 'notice' him when he is making an effort and doing well and praise/reward appropriately?

Thanks both. @ThanksItHasPockets - I would love to do this but he would kick up a huge fuss and I would be worried about how much it would cost. I won't rule it out, but I'd like to have a think about other options too. He did an online thing during covid that helped (English and Maths, he was Y4 at the time I think) but he was so happy when he caught up and could stop doing it.
@noblegiraffe do you think she would do that? It sounds like she has her hands full.

There's no harm in asking - I wouldn't mind.

The Covid thing you mention is the clue. It worked, and he was glad when it ended. So don't pitch him "a tutor". Pitch him a short fixed block: six sessions, then it stops, and he gets a say in whether it carries on. Boys who kick up a fuss about tutoring are usually objecting to the open-ended version of it.

On cost: online 1:1 is mostly £20 to £30 an hour now, and at Year 10 one session a fortnight is plenty for confidence. You're looking at well under £100 a month for the block, and a trial lesson first so he can decide whether he likes the person before you pay for anything.

What to look for is someone who starts from what he can already do and tells him so. A demotivated kid doesn't need a diagnostic of everything he's weak at in lesson one; he needs to leave the first session having got six things right in a row. Ask any tutor you try how they'd run that first lesson, and go with the one who talks about building him up rather than finding gaps.

Noblegiraffe's suggestion about the teacher is worth doing as well, and it costs nothing. The two together, teacher noticing him in class and someone outside class proving to him he can do it, is what usually turns this round by Christmas.

I run a small online tutoring platform, so weigh my view accordingly.

Thanks @CiaranC98 that's a helpful suggestion. I'll have a chat with him and see if he'd be open to it if it was time limited and if it was about making him feel more confident, rather than get high marks. I genuinely think he's actually pretty good at Maths. If he thought I thought he wasn't doing well, I think that would make it worse.